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<ul>
<li><a href="/go/01%E5%BC%80%E5%8F%91%E7%8E%AF%E5%A2%83%E6%90%AD%E5%BB%BA">0.1 开发环境搭建</a></li>
<li><a href="/go/02%E5%8F%98%E9%87%8F%E5%92%8C%E5%B8%B8%E9%87%8F">0.2 变量和常量</a></li>
<li><a href="/go/03%E5%9F%BA%E6%9C%AC%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B">0.3 基本数据类型</a></li>
<li><a href="/go/04%E6%B5%81%E7%A8%8B%E6%8E%A7%E5%88%B6%E5%92%8C%E8%BF%90%E7%AE%97%E7%AC%A6">0.4 流程控制和运算符</a></li>
<li><a href="/go/05%E6%95%B0%E7%BB%84">0.5 数组</a></li>
<li><a href="/go/06%E5%88%87%E7%89%87">0.6 切片</a></li>
<li><a href="/go/07map">0.7 map</a></li>
<li><a href="/go/08%E5%87%BD%E6%95%B0">0.8 函数</a></li>
<li><a href="/go/09%E6%8C%87%E9%92%88">0.9 指针</a></li>
<li><a href="/go/10%E5%8F%8D%E5%B0%84">1.0 反射</a></li>
<li><a href="/go/11%E7%BB%93%E6%9E%84%E4%BD%93">1.1 结构体</a></li>
<li><a href="/go/12%E6%8E%A5%E5%8F%A3">1.2 接口</a></li>
<li><a href="/go/%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/goroutine">1.3 goroutine</a></li>
<li><a href="/go/%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/channel">1.4 channel</a></li>
<li><a href="/go/%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/%E5%B9%B6%E5%8F%91%E5%AE%89%E5%85%A8%E5%92%8C%E9%94%81">1.5 并发安全和锁</a></li>
<li><a href="/go/%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/%E5%8E%9F%E5%AD%90%E6%93%8D%E4%BD%9C">1.6 原子操作</a></li>
<li><a href="/go/%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/GPM%E5%8E%9F%E7%90%86%E4%B8%8E%E8%B0%83%E5%BA%A6">1.7 GPM与调度分析</a></li>
<li><a href="/go/%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B/CSP%E5%B9%B6%E5%8F%91%E6%A8%A1%E5%9E%8B">1.8 CSP并发模型</a></li>
<li><a href="/go/%E6%A0%87%E5%87%86%E5%BA%93/fmt">标准库fmt</a></li>
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<li><a href="/go/%E6%A0%87%E5%87%86%E5%BA%93/go_%E6%A0%87%E5%87%86%E5%BA%93log">标准库log</a></li>
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## .NET

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* [2.2 Docker常用命令](/docker/2.2Docker常用命令)
* [Portainer可视化面板](/docker/Portainer可视化面板) 

## Linux

* [Centos安装](/linux/Centos安装)
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* [Centos网络配置](/linux/Centos网络配置)
* [Centos7升级gcc版本](/linux/Centos7升级gcc版本)
* [Linux常用命令](/linux/Linux常用命令)

## RabbitMQ

* [1.1 RabbitMQ概念及安装](/rabbitMq/1.1RabbitMQ概念及安装)
* [1.2 工作模式介绍](/rabbitMq/1.2工作模式介绍)
* [1.3 消息确认及持久化](/rabbitMq/1.3消息确认及持久化)
* [1.4 两种消费模式和QOS](/rabbitMq/1.4两种消费模式和QOS的实现)
* [1.5 Channel常见方法](/rabbitMq/1.5Channel常见方法)
* [1.6 RabbitMQ常用命令](/rabbitMq/1.6RabbitMQ常用命令)
* [1.7 RabbitMQ常见策略](/rabbitMq/1.7RabbitMQ常见策略)
* [1.8 RabbitMQ常见问题](/rabbitMq/1.8RabbitMQ常见问题)
* [1.9 RabbitMQ集群方案](/rabbitMq/1.9RabbitMQ集群方案)
* [客户端连接RabbitMQ](/rabbitMq/客户端连接RabbitMQ)

## Redis

* [1.1 NoSql概述](/redis/1.1NoSql概述)
* [1.2 Redis安装](/redis/1.2Redis安装)
* [1.3 Redis基本数据类型](/redis/1.3Redis基本数据类型)
* [1.4 Redis特殊数据类型](/redis/1.4Redis特殊数据类型)
* [1.5 Redis事务操作](/redis/1.5Redis事务操作)
* [1.6 Redis配置文件详解](/redis/1.6Redis配置文件详解)
* [1.7 Redis持久化](/redis/1.7Redis持久化)
* [1.8 Redis发布订阅](/redis/1.8Redis发布订阅)
* [1.9 Redis集群方案](/redis/1.9Redis集群方案)
* [1.10 Redis常见问题](/redis/1.10Redis常见问题)
* [客户端连接Redis](/redis/客户端连接Redis)
* [使用Docker搭建Redis集群](/redis/使用Docker搭建Redis集群)

## MicroService

* [1.1 微服务之项目搭建](/microservice/1.1微服务入门之项目搭建)
* [1.2 微服务之服务注册发现](/microservice/1.2微服务入门之服务注册与发现)
* [1.3 微服务之网关](/microservice/1.3微服务入门之网关)
* [1.4 微服务之事件总线](/microservice/1.4微服务入门之事件总线)
* [1.5 微服务之DockerCompose](/microservice/1.5微服务入门之DockerCompose)
* [Consul服务注册发现](/microservice/Consul服务注册发现)

## Test

* [单元测试](/test/单元测试)
* [集成测试](/test/集成测试)
* [压力测试k6](/test/压力测试k6)
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  <p>Go语言内置的<code>flag</code>包实现了命令行参数的解析，使得开发命令行工具更为简单。</p>
<h1 id="os-Args">os.Args</h1>
<p>如果只是简单的想要获取命令行参数，可以像下面的代码示例一样使用 <code>os.Args</code> 来获取命令行参数。</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> main</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">&quot;fmt&quot;</span></span><br><span class="line">	<span class="string">&quot;os&quot;</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="comment">// 最简单的获取命令行参数</span></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">getOsArgs</span><span class="params">()</span></span> &#123;</span><br><span class="line">	<span class="comment">// os.Args是一个[]string</span></span><br><span class="line">	<span class="keyword">if</span> <span class="built_in">len</span>(os.Args) &gt; <span class="number">0</span> &#123;</span><br><span class="line">		<span class="keyword">for</span> index, arg := <span class="keyword">range</span> os.Args &#123;</span><br><span class="line">			fmt.Printf(<span class="string">&quot;args[%d]=%v\n&quot;</span>, index, arg)</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">PS D:\GoProject\src&gt; go run .\flagTest.go <span class="string">&quot;a&quot;</span> <span class="string">&quot;s&quot;</span> <span class="string">&quot;1&quot;</span></span><br><span class="line">args[0]=C:\Users\ADMINI~1\AppData\Local\Temp\go-build752076497\b001\exe\flagTest.exe</span><br><span class="line">args[1]=a</span><br><span class="line">args[2]=s</span><br><span class="line">args[3]=1</span><br></pre></td></tr></table></figure>
<p><code>os.Args</code> 是一个存储命令行参数的字符串切片，第一个元素是执行文件的名称。</p>
<h1 id="flag包使用">flag包使用</h1>
<p>介绍 <code>flag</code> 包的常用函数和基本用法，更详细的内容请查看<a target="_blank" rel="noopener" href="https://studygolang.com/pkgdoc">官方文档</a>。</p>
<h1 id="导入flag包">导入flag包</h1>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> flag</span><br></pre></td></tr></table></figure>
<h1 id="flag参数类型">flag参数类型</h1>
<p><code>flag</code>  包支持的命令行参数类型有<code>bool</code>、<code>int</code>、<code>int64</code>、<code>uint</code>、<code>uint64</code>、<code>float</code> <code>float64</code>、<code>string</code>、<code>duration</code>。</p>
<table>
<thead>
<tr>
<th style="text-align:center">flag参数</th>
<th style="text-align:center">有效值</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">字符串flag</td>
<td style="text-align:center">合法字符串</td>
</tr>
<tr>
<td style="text-align:center">整数flag</td>
<td style="text-align:center">1234、0664、0x1234等类型，也可以是负数。</td>
</tr>
<tr>
<td style="text-align:center">浮点数flag</td>
<td style="text-align:center">合法浮点数</td>
</tr>
<tr>
<td style="text-align:center">bool类型flag</td>
<td style="text-align:center">1, 0, t, f, T, F, true, false, TRUE, FALSE, True, False。</td>
</tr>
<tr>
<td style="text-align:center">时间段flag</td>
<td style="text-align:center">任何合法的时间段字符串。如”300ms”、”-1.5h”。 合法的单位有”ns”、”us” /“µs”、”ms”、”s”、”m”、”h”。</td>
</tr>
</tbody>
</table>
<h1 id="定义命令行flag参数">定义命令行flag参数</h1>
<p>有以下两种常用的定义命令行 <code>flag</code> 参数的方法。</p>
<h3 id="flag-Type">flag.Type()</h3>
<p>基本格式：<code>flag.Type(flag名, 默认值, 帮助信息)*Type</code></p>
<p>例如：要定义姓名、年龄、婚否三个命令行参数可以按如下方式定义：</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">name := flag.String(<span class="string">&quot;name&quot;</span>, <span class="string">&quot;张三&quot;</span>, <span class="string">&quot;姓名&quot;</span>)</span><br><span class="line">age := flag.Int(<span class="string">&quot;age&quot;</span>, <span class="number">18</span>, <span class="string">&quot;年龄&quot;</span>)</span><br><span class="line">married := flag.Bool(<span class="string">&quot;m&quot;</span>, <span class="literal">false</span>, <span class="string">&quot;婚否&quot;</span>)</span><br><span class="line">delay := flag.Duration(<span class="string">&quot;d&quot;</span>, <span class="number">0</span>, <span class="string">&quot;时间间隔&quot;</span>)</span><br></pre></td></tr></table></figure>
<p>需要注意：此时<code>name</code>、<code>age</code>、<code>married</code>、<code>delay</code>均为对应类型的指针。</p>
<h3 id="flag-TypeVar">flag.TypeVar()</h3>
<p>基本格式： <code>flag.TypeVar(Type指针, flag名, 默认值, 帮助信息)</code></p>
<p>例如要定义姓名、年龄、婚否三个命令行参数，可以按如下方式定义：</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> name <span class="type">string</span></span><br><span class="line"><span class="keyword">var</span> age <span class="type">int</span></span><br><span class="line"><span class="keyword">var</span> married <span class="type">bool</span></span><br><span class="line"><span class="keyword">var</span> delay time.Duration</span><br><span class="line">flag.StringVar(&amp;name, <span class="string">&quot;name&quot;</span>, <span class="string">&quot;张三&quot;</span>, <span class="string">&quot;姓名&quot;</span>)</span><br><span class="line">flag.IntVar(&amp;age, <span class="string">&quot;age&quot;</span>, <span class="number">18</span>, <span class="string">&quot;年龄&quot;</span>)</span><br><span class="line">flag.BoolVar(&amp;married, <span class="string">&quot;m&quot;</span>, <span class="literal">false</span>, <span class="string">&quot;婚否&quot;</span>)</span><br><span class="line">flag.DurationVar(&amp;delay, <span class="string">&quot;d&quot;</span>, <span class="number">0</span>, <span class="string">&quot;时间间隔&quot;</span>)</span><br></pre></td></tr></table></figure>
<h1 id="解析命令行参数">解析命令行参数</h1>
<p>通过以上两种方法定义好命令行flag参数后，需要通过调用<code>flag.Parse()</code>来对命令行参数进行解析</p>
<p>支持的命令行参数格式有以下几种：</p>
<ul>
<li><code>-flag xxx</code> （使用空格，一个<code>-</code>符号）</li>
<li><code>--flag xxx</code> （使用空格，两个<code>-</code>符号）</li>
<li><code>-flag=xxx</code> （使用等号，一个<code>-</code>符号）</li>
<li><code>--flag=xxx</code> （使用等号，两个<code>-</code>符号）</li>
</ul>
<p>其中，布尔类型的参数必须使用等号的方式指定。</p>
<p>Flag 解析在第一个非flag参数（单个”-“不是flag参数）之前停止，或者在终止符”–“之后停止。</p>
<h1 id="flag其他函数">flag其他函数</h1>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">flag.Args()  <span class="comment">// 返回命令行参数后的其他参数，以[]string类型</span></span><br><span class="line">flag.NArg()  <span class="comment">// 返回命令行参数后的其他参数个数</span></span><br><span class="line">flag.NFlag() <span class="comment">// 返回使用的命令行参数个数</span></span><br></pre></td></tr></table></figure>
<h1 id="使用示例">使用示例</h1>
<p>命令行参数使用提示：</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">PS D:\GoProject\src&gt; go run .\flagTest.go -<span class="built_in">help</span> </span><br><span class="line">Usage of C:\Users\ADMINI~1\AppData\Local\Temp\go-build3280475971\b001\exe\flagTest.exe:</span><br><span class="line">  -age int</span><br><span class="line">        年龄 (default 18)</span><br><span class="line">  -d duration</span><br><span class="line">        时间间隔</span><br><span class="line">  -m    婚否</span><br><span class="line">  -name string</span><br><span class="line">        姓名 (default <span class="string">&quot;张三&quot;</span>)</span><br></pre></td></tr></table></figure>
<p>正常使用命令行flag参数：</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">PS D:\GoProject\src&gt; go run .\flagTest.go -name=wpl -age=18 -m=<span class="literal">false</span> --d=1h</span><br><span class="line">wpl 18 <span class="literal">false</span> 1h0m0s</span><br><span class="line">[]</span><br><span class="line">0 </span><br><span class="line">4 </span><br></pre></td></tr></table></figure>
<p>使用非flag命令行参数：</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">PS D:\GoProject\src&gt; go run .\flagTest.go  a b c                           </span><br><span class="line">张三 18 <span class="literal">false</span> 0s</span><br><span class="line">[a b c]</span><br><span class="line">3      </span><br><span class="line">0     </span><br></pre></td></tr></table></figure>
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